package org.epic.perleditor.templates.ui.dialog;

import org.epic.perleditor.PerlPluginImages;

import org.eclipse.core.runtime.IStatus;
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.CLabel;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.RGB;
import org.eclipse.swt.widgets.Composite;

/**
 * A message line displaying a status.
 */
public class MessageLine extends CLabel {
    
    private static final RGB ERROR_BACKGROUND_RGB = new RGB(230, 226, 221);
    
    private Color fNormalMsgAreaBackground;
    private Color fErrorMsgAreaBackground;

    /**
     * Creates a new message line as a child of the given parent.
     */
    public MessageLine(Composite parent) {
        this(parent, SWT.LEFT);
    }

    /**
     * Creates a new message line as a child of the parent and with the given SWT stylebits.
     */
    public MessageLine(Composite parent, int style) {
        super(parent, style);
        fNormalMsgAreaBackground= getBackground();
        fErrorMsgAreaBackground= null;
    }

    
    private Image findImage(IStatus status) {
        if (status.isOK()) {
            return null;
        } else if (status.matches(IStatus.ERROR)) {
            return PerlPluginImages.get(PerlPluginImages.IMG_OBJS_ERROR);
        } else if (status.matches(IStatus.WARNING)) {
            return PerlPluginImages.get(PerlPluginImages.IMG_OBJS_WARNING);
        } else if (status.matches(IStatus.INFO)) {
            return PerlPluginImages.get(PerlPluginImages.IMG_OBJS_INFO);
        }
        return null;
    }

    /**
     * Sets the message and image to the given status.
     * <code>null</code> is a valid argument and will set the empty text and no image
     */
    public void setErrorStatus(IStatus status) {
        if (status != null) {
            String message= status.getMessage();
            if (message != null && message.length() > 0) {
                setText(message);
                setImage(findImage(status));
                if (fErrorMsgAreaBackground == null) {
                    fErrorMsgAreaBackground= new Color(getDisplay(), ERROR_BACKGROUND_RGB);
                }
                setBackground(fErrorMsgAreaBackground);
                return;
            }
        }		
        setText("");
        setImage(null);
        setBackground(fNormalMsgAreaBackground);	
    }
    
    /*
     * @see Widget#dispose()
     */
    public void dispose() {
        if (fErrorMsgAreaBackground != null) {
            fErrorMsgAreaBackground.dispose();
            fErrorMsgAreaBackground= null;
        }
        super.dispose();
    }
}